supposition, n. hypothesis, [conjecture], [surmise], assumption, presumption, postulate.
suppositional, a. hypothetical, conjectural, [supposed], [assumed].
suppress, v. [quell], [overpower], put [down]; [check], [repress], [restrain]; [secrete], conceal.
suppression, n. [quelling], [overthrow]; [repression], [restraint]; [concealment], [secretion].
supreme, a. transcendent, preëminent, superlative, paramount, [predominant].
surcingle, n. [girth].
sure, a. [certain], inevitable; [positive], [confident], assured, sanguine, convinced; unfailing, [infallible], [unerring], inerrable, [abiding], [stable], trustworthy, [reliable], [dependable], [secure], [safe]. Antonyms: [uncertain], [doubtful], [dubious].
sureness, n. [certainty], inevitability, [assurance], certitude, [safety], positiveness.
surety, n. [sureness], [certainty]; [security], [pledge], guaranty; [bondsman]; [substitute], hostage; [sponsor]; [ratification], corroboration.
surface, n. exterior, [outside], superficies.